Răspuns :
r+g=70 =>r=70-g
2r+g=100
2(70-g)+g=100
140-2g+g=100
g=140-100=>g=40 lei
=>2r=100-40 =>2r=60 =>r=30 lei
2r+g=100
2(70-g)+g=100
140-2g+g=100
g=140-100=>g=40 lei
=>2r=100-40 =>2r=60 =>r=30 lei